As a part of branching to stage 0.2.0 release in #266, set version
for continued development on master branch.

[voldemort] disable voldemort pending maven accessible artifacts.

[packaging] ensure datastore binding specific distributions include core transitive deps

closes #279 

closes #297

Add build instructions to README, update DB-specific build docs.

[packaging] refactor packaging to avoid fat-jars.

* remove unused declared deps in a few places
* lex sort modules in top level pom
* update maven plugin versions.
* no more jar-with-dependencies
* set ycsb-core to provided in bindings
* introduce a bindings-parent pom that sets
** stage dependency copy on building binding
** iff binding has a README.md, build a binding-specific dist artifact
* update distribution assembly to
** properly build after modules
** use per-binding sets of dependencies

closes #250

    [core] use HdrHistogram and fix coordinated omission

also closes #10

- Make status interval configurable

- Output old histogram or HdrHistogram or both
- Potentially output HdrHistogram to log file on status interval.

Add a joined histogram measuremement to compare old/new histogram
outputs.

Add option for controlling the feature(default on).

Remove needless synchronization by using CHM in Measurements.

Add option to randomize delay(default=true, as before)

throttle method in client.

[tarantool] Add Tarantool database

Move configuration files to position, so they'll be included into
binary artifact.

 [exporter] added JSONArrayMeasurementsExporter

http://tarantool.org and https://github.com/tarantool/tarantool
In "mail.ru" we wrote and widely use Tarantool key-value database.
It's key properties include:

* Defferent index types with iterators:
    - HASH (the fastest)
    - TREE (range and ordered retreival)
    - BITSET (bit mask search)
    - RTREE (geo search)
* multipart keys for HASH and TREE indexes
* Data persistence with by Write Ahead Log (WAL) and snapshots.
* asynchronous master-master replication, hot standby.
* coroutines and async. IO are used to implement high-performance lock-free access to data.
    - socket-io/file-io with yeilds from lua
* stored procedures in Lua (Using LuaJIT)
* supports plugins written on C/C++ (Have two basic plugins for working with MySQL and PostgreSQL)
* Authentication and access control

Move 'distribution target' to the end (it's needed for .jar to be in the .tar.gz)

 [exporter] added JSONArrayMeasurementsExporter which generates one JSON array of measurement objects.

Fix #284 - Switch to travis starting the test mongod instance.